Georg kohl



llNrrnn STATES EMU,

ATENT GEORG KOHL, OF VIENNA, AUSTRIA-HUNGARY, ASSIGNOR OF THREE-FIFTHSTO ARMIN BERGL, OF SAME PLACE, AND VICTOR VON THEUMER, OF

MAUER, AUSTRIA-HUNGARY.

GLOW-BODY FOR INCANDESCENT BU RNERS.

SPECIFICATION forming part of Letters Patent No. 623,724, dated April25, 1899.

Application filed August 3 189 8.

T at whom it may concern.-

Be it known that I, GEORG KOHL, a subject of the Emperor ofAustria-Hungary, residing at Vienna, in the Province of Lower Austria,

5 in the Empire of Austria-Hungary, have invented certain new and usefulImprovements in the Manufacture of Glow Bodies for Incandescent Burners;and I do hereby declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it ap pertains to make and use the same.

In the glow-bodies for incandescent burners heretofore known the upperfolded part of the mantle has been painted at the place where ithas beenattached, by means of asbestos threads, to the wire hook with a solutionof aluminium nitrate, magnesium nitrate, or beryllium nitrate with theobject of prevent 2o ing the glow-body from being drawn away from itssupport. Now all the attempts that have been heretofore made for thispurpose have, however, not had the desired success, because the mixturesemployed for impreg- 2 5 nating the top of the glow-body become eithertoo hard, and consequently brittle and crumbly, so that the glow-body isbroken off by shocks, or the top of the glow-body remains too soft, aswhen beryllium is employed, and

comes undone, and the mantle consequently is very easily and quicklydestroyed.

Now the object of this invention is to strengthen the top of theglow-body, so that it will be neither soft nor brittle, but will be astenacious as possible, and consequently,

along with a unique elasticity, will have sufficient strength producedby its tenacity when incinerated. According to the method employed forproducing this strengthening the top of the glow-body (which has beenimpregnated according to any method with the substances that produce theemission of light or also with strengthening substances) is impregnatedwith a solution produced by dissolving in 1.5 kilograms of water threehundred grams of aluminium nitrate, three hundred grams of magnesiumnitrate, two grams Serial No. 687,630. (No model.)

of chromium nitrate, two grams of manganese nitrate, 20 grams of calciumnitrate, five grams of alum, and five grams of boraX. The top of theglow-body is only moderately saturated with this solution, and in thesubsequent drying operation the glow-body is hung with the top downwardfor the purpose of preventing the solution from spreading over any 5 5considerable portion of the light-emitting surface of the mantle,because this solution would diminishtheilluminatingpowerthereof. Thesolution, which, however, in consequence of the suction does spread inthe narrow portion of the mantle next to the top or head, has theresult, since it diminishes gradually in the strip, of producing thedesired gradual merging of the tough strengthened head into the (afterincineration) elastic and simple mantle without aifecting the capacityfor emitting light. After drying, which is to be rapidly done, theglow-body is attached in the usual manner to the wire hook and isfinally glowed, whereby all the substances with which the glow-body isimpregnated are 0011- verted into the corresponding oxids.

I claim 1. The method of strengthening mantles or hoods of refractoryincandescible material at 7 5 the point where a suspending-wire isapplied, which consists in applying to that part of the mantle anaqueous solution of a flux, as alum and borax and of nitrates ofaluminium, magnesium, chromium, manganese and calcium, substantially asset forth.

2. An incandescible mantle having the point where such mantle is to besuspended for use strengthened with a compound consisting of a flux asalum and borax and oXids of aluminium, magnesium, chromium, manganeseand calcium, substantially as set forth.

In. testimony that'I claim the foregoing as my invention I have signedmy name in presence of two subscribing witnesses.

' GEORG KOHL.

Witnesses:

HENRY C. CARPENTER, ALVESTO S. HOGUE.

